The Omnibus Transportation Employee Testing Act of 1991 requires all employers to drug test transportation workers who perform safety-sensitive functions, such as employees whose jobs require them to have a commercial driver's license or operate motor vehicles that weigh more than 26,001 pounds, transport hazardous materials, or carry 15 passengers or more.

The legislative call for testing resulted in the Omnibus Transportation Employee Testing Act of 1991, which requires at least four types of alcohol and controlled-substance tests for all drivers who hold a commercial license.

Among the first subjects to be addressed by the Drug Testing Journal, Morgan said, will be the ramifications of the Omnibus Transportation Employee Testing Act of 1991, which adds alcohol to the list of substances for which millions of American workers will be required to be tested.